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Authors: | Acocella, V.* Neri, M.* Walter, T. R.* |
Title: | Structural features of Panarea volcano in the frame of the Aeolian Arc (Italy): Implications for the 2002–2003 unrest | Journal: | Journal of Geodynamics | Series/Report no.: | /47 (2009) | Publisher: | Elsevier Ltd | Issue Date: | May-2009 | DOI: | 10.1016/j.jog.2009.01.004 | URL: | http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V9X-4VDY84H-1&_user=5381242&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000067082&_version=1&_urlVersion=0&_userid=5381242&md5=bf5b1c1c12bb7a046b2205cd097544b1 | Keywords: | Panarea Aeolian Arc fault dike 2002-2003 unrest |
Subject Classification: | 04. Solid Earth::04.01. Earth Interior::04.01.99. General or miscellaneous 04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneous 04. Solid Earth::04.04. Geology::04.04.09. Structural geology 04. Solid Earth::04.07. Tectonophysics::04.07.99. General or miscellaneous 04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics 04. Solid Earth::04.07. Tectonophysics::04.07.04. Plate boundaries, motion, and tectonics 04. Solid Earth::04.07. Tectonophysics::04.07.05. Stress 04. Solid Earth::04.07. Tectonophysics::04.07.06. Subduction related processes 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics 04. Solid Earth::04.07. Tectonophysics::04.07.08. Volcanic arcs 04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring 04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk 05. General::05.02. Data dissemination::05.02.03. Volcanic eruptions |
Abstract: | Panarea, characterized by gas unrest in 2002–2003, is the volcanic island with the least constrained structure in the eastern-central Aeolian Arc (Italy). Based on structural measurements, we define here its deformation pattern relative to the Arc. The main deformations are subvertical extension fractures (63% of data), normal faults (25%) and dikes (12%). The mean orientation of the extension fractures and faults is ∼N38◦E, with a mean opening direction of N135◦ ±8◦, implying extension with a moderate component of dextral shear. These data, matched with those available for Stromboli volcano (pure opening) and Vulcano, Lipari and Salina volcanoes (predominant dextralmotions) along the eastern-central Arc, suggest a progressivewestward rotation of the extension direction and an increase in the dextral shear. The dextral shear turns into compression in the western arc. The recent unrest at Panarea, coeval to that of nearby Stromboli, may also be explained by the structural context, as both volcanoes lie along the portion of the Arc subject to extension. |
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